Abstract
Buprofezin is a widely used insecticide that has caused environmental pollution in many areas. However, biodegradation of buprofezin by pure cultures has not been extensively studied, and the transformation pathway of buprofezin remains unclear. In this paper, a buprofezin co-metabolizing strain of DFS35-4 was isolated from a buprofezin-polluted soil in China. Strain DFS35-4 was preliminarily identified as Pseudomonas sp. based on its morphological, physiological, and biochemical properties, as well as 16S rRNA gene analysis. In the presence of 2.0 g l−1 sodium citrate, strain DFS35-4 degraded over 70% of 50 mg l−1 buprofezin in 3 days. Strain DFS35-4 efficiently degraded buprofezin in the pH range of 5.0–10.0 and at temperatures between 20 and 30°C. Three metabolites, 2-imino-5-phenyl-3-(propan-2-yl)-1,3,5-thiadiazinan-4-one, 2-imino-5-phenyl-1,3,5-thiadiazinan-4-one, and methyl(phenyl) carbamic acid, were identified during the degradation of buprofezin using gas chromatography–mass spectrometry (GC–MS) and tandem mass spectrometry (MS/MS). A partial transformation pathway of buprofezin in Pseudomonas sp. DFS35-4 was proposed based on these metabolites.
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Acknowledgments
We gratefully acknowledge Dr. Weiyou Zhou of Nanjing Science and Technology University for excellent assistance in GC–MS analysis. This work was supported by grants from the Chinese National Natural Science Foundation (31070100), the Major Projects on Control and Rectification of Water Body Pollution (2009ZX07103-002), and the Key Technology R&D Program of Jiangsu Province (BE2009670).
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Chen, K., Liu, XM., Li, R. et al. Isolation of a buprofezin co-metabolizing strain of Pseudomonas sp. DFS35-4 and identification of the buprofezin transformation pathway. Biodegradation 22, 1135–1142 (2011). https://doi.org/10.1007/s10532-011-9469-x
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DOI: https://doi.org/10.1007/s10532-011-9469-x